JPH10275679A - Organic el element - Google Patents
Organic el elementInfo
- Publication number
- JPH10275679A JPH10275679A JP9079596A JP7959697A JPH10275679A JP H10275679 A JPH10275679 A JP H10275679A JP 9079596 A JP9079596 A JP 9079596A JP 7959697 A JP7959697 A JP 7959697A JP H10275679 A JPH10275679 A JP H10275679A
- Authority
- JP
- Japan
- Prior art keywords
- light emitting
- layer
- organic
- emitting layer
- transparent electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000005394 sealing glass Substances 0.000 claims abstract description 19
- 239000011521 glass Substances 0.000 claims abstract description 11
- 239000000758 substrate Substances 0.000 claims abstract description 8
- 239000011261 inert gas Substances 0.000 claims description 7
- 239000011368 organic material Substances 0.000 claims description 6
- 239000000969 carrier Substances 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims 1
- 230000005525 hole transport Effects 0.000 abstract description 13
- 229910052751 metal Inorganic materials 0.000 abstract description 12
- 239000002184 metal Substances 0.000 abstract description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 6
- 238000009792 diffusion process Methods 0.000 abstract description 5
- 229910001873 dinitrogen Inorganic materials 0.000 abstract description 4
- 238000005401 electroluminescence Methods 0.000 abstract description 2
- 238000007789 sealing Methods 0.000 abstract 3
- 239000007789 gas Substances 0.000 abstract 2
- 238000004020 luminiscence type Methods 0.000 abstract 2
- 239000010410 layer Substances 0.000 description 54
- 230000000694 effects Effects 0.000 description 5
- 230000002411 adverse Effects 0.000 description 4
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- DCZNSJVFOQPSRV-UHFFFAOYSA-N n,n-diphenyl-4-[4-(n-phenylanilino)phenyl]aniline Chemical compound C1=CC=CC=C1N(C=1C=CC(=CC=1)C=1C=CC(=CC=1)N(C=1C=CC=CC=1)C=1C=CC=CC=1)C1=CC=CC=C1 DCZNSJVFOQPSRV-UHFFFAOYSA-N 0.000 description 3
- 229910010413 TiO 2 Inorganic materials 0.000 description 2
- 229910021536 Zeolite Inorganic materials 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- -1 quinolinol aluminum Chemical compound 0.000 description 2
- 238000003980 solgel method Methods 0.000 description 2
- 239000010457 zeolite Substances 0.000 description 2
- 229910006404 SnO 2 Inorganic materials 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- 239000005340 laminated glass Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000012044 organic layer Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- ODHXBMXNKOYIBV-UHFFFAOYSA-N triphenylamine Chemical compound C1=CC=CC=C1N(C=1C=CC=CC=1)C1=CC=CC=C1 ODHXBMXNKOYIBV-UHFFFAOYSA-N 0.000 description 1
- 238000007738 vacuum evaporation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/84—Passivation; Containers; Encapsulations
- H10K50/846—Passivation; Containers; Encapsulations comprising getter material or desiccants
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/84—Passivation; Containers; Encapsulations
- H10K50/842—Containers
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ガラス基板上に形
成された透明電極とこれに対向する対向電極の間に有機
材料からなる発光層を狭持し、両電極からキャリアを発
光層に注入することによって発光層を発光させる有機Ｅ
Ｌ（エレクトロ・ルミネッセンス）素子に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting layer made of an organic material sandwiched between a transparent electrode formed on a glass substrate and a counter electrode facing the transparent electrode, and carriers are injected into the light emitting layer from both electrodes. To make the light emitting layer emit light by
The present invention relates to an L (electroluminescence) element.
【０００２】[0002]
【従来の技術】有機ＥＬ素子を利用した平面ディスプレ
イは、次世代のディスプレイとして大きな注目を浴びて
おり、これについての研究開発が盛んに行われている。
特に、有機ＥＬ素子を利用すれば、直流低電圧駆動、高
視野角、自発光などの特徴を有する高解像度ディスプレ
イが実現可能であり、その利用価値は非常に高いと考え
られている。2. Description of the Related Art A flat display using an organic EL element has received a great deal of attention as a next-generation display, and R & D on this is being actively pursued.
In particular, if an organic EL element is used, a high-resolution display having features such as direct-current low-voltage driving, a high viewing angle, and self-emission can be realized, and its use value is considered to be extremely high.
【０００３】この有機ＥＬ素子は、例えばガラス基板上
に、透明電極（陽極）／正孔輸送層／発光層／金属電極
（陰極）を積層形成した構成を有している。また、陽極
には仕事関数の大きな物質が用いられ、陰極には仕事関
数の小さな物質が用いられる。そして、正孔輸送層及び
発光層に有機材料が用いられ、両電極から注入される正
孔と、電子が発光層において、再結合することによって
発光する。[0003] This organic EL device has a structure in which a transparent electrode (anode) / a hole transport layer / a light emitting layer / a metal electrode (cathode) are laminated on a glass substrate, for example. A material having a large work function is used for the anode, and a material having a small work function is used for the cathode. Then, an organic material is used for the hole transport layer and the light emitting layer, and the holes injected from both electrodes and the electrons recombine in the light emitting layer to emit light.
【０００４】ここで、正孔輸送層や発光層に利用する固
体有機材料は、水分や、酸素などに侵されやすく、大気
中で有機ＥＬ素子を駆動するとその発光特性が急激に劣
化する。そこで、有機ＥＬ素子では、有機や無機の保護
層を設け素子を封止し、大気から隔離している。また、
合わせガラスなどを用い、素子部の雰囲気を不活性ガス
に置換する構成も提案されている。[0004] Here, the solid organic material used for the hole transport layer and the light emitting layer is easily attacked by moisture, oxygen, and the like, and when the organic EL element is driven in the air, the light emitting characteristics are rapidly deteriorated. Therefore, in the organic EL element, an organic or inorganic protective layer is provided to seal the element and to isolate it from the atmosphere. Also,
A configuration in which the atmosphere of the element section is replaced with an inert gas using laminated glass or the like has also been proposed.
【０００５】[0005]
【発明が解決しようとする課題】このように、保護層を
設けたり雰囲気を不活性ガスに置換することによって、
有機ＥＬ素子の寿命を延ばすことができる。しかし、製
造工程において、ガラス板の表面や素子の表面に吸着さ
れている水分は、素子の雰囲気に封入されてしまう。従
って、非発光点が生じやすいなど、十分な素子寿命を得
られないという問題点があった。特に、有機ＥＬ素子で
は、１０Ｖの印加で１０００ｃｄ／ｍ2を超える輝度が
得られ、最近の研究では、発光層へのドーピングによっ
て、輝度はさらに改善され、１０万ｃｄ／ｍ2の輝度が
得られるとの報告もある。例えば、有機ＥＬ素子を平面
光源として利用することを考えると、数１０００ｃｄ／
ｍ2の発光が必要であり、それに必要な電流は１００ｍ
Ａ／ｃｍ2以上になる。このような高輝度有機ＥＬ素子
の場合には、水分の悪影響が顕著になるため、素子雰囲
気の水分をより高度に除去したいという要求がある。Thus, by providing a protective layer or replacing the atmosphere with an inert gas,
The life of the organic EL element can be extended. However, in the manufacturing process, moisture adsorbed on the surface of the glass plate or the surface of the element is enclosed in the atmosphere of the element. Therefore, there is a problem that a sufficient element life cannot be obtained, for example, a non-light emitting point is easily generated. In particular, in an organic EL device, a luminance exceeding 1000 cd / m 2 can be obtained by applying 10 V. In a recent study, the luminance was further improved by doping the light emitting layer, and a luminance of 100,000 cd / m 2 was obtained. There are reports that this will be done. For example, considering that an organic EL element is used as a flat light source, several thousand cd /
emission of m 2 is necessary, it required current 100m
A / cm 2 or more. In the case of such a high-brightness organic EL element, the adverse effect of moisture becomes remarkable, and there is a demand for removing the moisture in the element atmosphere to a higher degree.
【０００６】本発明は、上記課題に鑑みなされたもので
あり、高度の水分の排除を達成できる有機ＥＬ素子を提
供することを目的とする。The present invention has been made in view of the above problems, and has as its object to provide an organic EL device capable of achieving a high degree of water elimination.
【０００７】[0007]
【課題を解決するための手段】本発明は、ガラス基板上
に形成された透明電極とこれに対向する対向電極の間に
有機材料からなる発光層を狭持し、両電極からキャリア
を発光層に注入することによって発光層を発光させる有
機ＥＬ素子において、上記少なくとも発光層及び一方の
電極を囲う封止ガラス板により密封室を形成し、この密
封室内に不活性ガスを封入すると共に、封止ガラス板の
内面に吸湿性多孔質層を設けることを特徴とする。According to the present invention, a light emitting layer made of an organic material is interposed between a transparent electrode formed on a glass substrate and a counter electrode facing the transparent electrode, and carriers are emitted from both electrodes. In an organic EL device that emits a light-emitting layer by injecting it into a sealed chamber, a sealed chamber is formed by a sealing glass plate surrounding at least the light-emitting layer and one of the electrodes, and an inert gas is sealed in the sealed chamber and sealed. It is characterized in that a hygroscopic porous layer is provided on the inner surface of the glass plate.
【０００８】このような有機ＥＬ素子において、透明電
極と、対向電極とに電圧を印加することで、両電極よ
り、正孔、電子が注入され、これが発光層において再結
合し発光する。そして、封止ガラスによって形成された
密封室内に、発光層、対向電極からなる素子部が収容さ
れているため、大気からの水分の内部への拡散が有効に
防止され、素子特性への悪影響を排除することができ
る。In such an organic EL device, by applying a voltage to the transparent electrode and the counter electrode, holes and electrons are injected from both electrodes, and recombine in the light emitting layer to emit light. Further, since the element portion including the light emitting layer and the counter electrode is accommodated in the sealed chamber formed by the sealing glass, diffusion of moisture from the atmosphere into the inside is effectively prevented, and adverse effects on the element characteristics are prevented. Can be eliminated.
【０００９】特に、封止ガラスの内面に吸湿性の多孔質
層が形成されている。従って、製造時において、素子部
の表面や透明電極の表面に吸着されている水分がこの多
孔質層によって除去され、密封室内を水分のない状態に
維持できる。従って、素子に対する水分の拡散を確実に
防止して、非発光点の発生を防止して、素子の長寿命化
を図ることができる。特に、高輝度発光においても、長
寿命化を図ることができる。In particular, a hygroscopic porous layer is formed on the inner surface of the sealing glass. Therefore, at the time of manufacturing, the moisture adsorbed on the surface of the element portion and the surface of the transparent electrode is removed by the porous layer, and the sealed chamber can be kept free of moisture. Therefore, it is possible to reliably prevent the diffusion of moisture into the element, prevent the occurrence of non-light emitting points, and extend the life of the element. In particular, even in high-luminance light emission, the life can be extended.
【００１０】[0010]
【発明の実施の形態】以下、本発明の実施の形態（以下
実施形態という）について、図面に基づいて説明する。Embodiments of the present invention (hereinafter referred to as embodiments) will be described below with reference to the drawings.
【００１１】図１は、本実施形態に係る有機ＥＬ素子の
構成を示す図である。ガラス基板１０の上面には、透明
電極１２が形成されている。この透明電極１２は、ＩＴ
Ｏ（インジウム・チン・オキサイド）、ＳｎＯ2などが
利用される。この透明電極１２の上に有機材料からなる
正孔輸送層１４、発光層１６が積層形成される。正孔輸
送層１４はＴＰＤ（トリフェニルジアミン）、発光層１
６はＡｌｑ（キノリノールアルミ錯体）等により形成さ
れる。発光層１６の上には、金属陰極１８が形成され
る。この金属陰極１８には、ＭｇＡｇ（９：１）、Ａｌ
Ｌｉ（９．９：０．１）、Ｍａｌｎ（９：１）等が採用
される。FIG. 1 is a diagram showing a configuration of an organic EL device according to this embodiment. On the upper surface of the glass substrate 10, a transparent electrode 12 is formed. This transparent electrode 12 is made of IT
O (indium tin oxide), SnO 2 or the like is used. On this transparent electrode 12, a hole transport layer 14 and a light emitting layer 16 made of an organic material are laminated. The hole transport layer 14 is made of TPD (triphenyldiamine),
6 is formed of Alq (quinolinol aluminum complex) or the like. A metal cathode 18 is formed on the light emitting layer 16. The metal cathode 18 includes MgAg (9: 1), Al
Li (9.9: 0.1), Maln (9: 1) and the like are adopted.
【００１２】そして、正孔輸送層１４、発光層１６、金
属陰極１８の側面を含む全体を囲うように、キャップ状
の封止ガラス２０を設置して密封室２２を形成し、この
密封室２２内に正孔輸送層１４、発光層１６、金属陰極
１８を収容する。Then, a cap-shaped sealing glass 20 is provided so as to surround the whole including the side surfaces of the hole transport layer 14, the light emitting layer 16, and the metal cathode 18, thereby forming a sealed chamber 22. The hole transport layer 14, the light emitting layer 16, and the metal cathode 18 are accommodated therein.
【００１３】この封止ガラス２０の端部の透明電極１２
への取り付けは、窒素ガスなどの不活性ガス中において
エポキシ系樹脂等を用いた接着によって行う。従って、
密封室２２内には、不活性ガスが充満された状態にな
る。The transparent electrode 12 at the end of the sealing glass 20
Attachment is performed by bonding using an epoxy resin or the like in an inert gas such as a nitrogen gas. Therefore,
The inside of the sealed chamber 22 is filled with an inert gas.
【００１４】さらに、封止ガラス２０の内面側には、吸
湿性を有する多孔質層２４が形成されている。この多孔
質層２４は、封止ガラス２０の内面にゾルゲル法などに
よってＳｉＯ2、ＴｉＯ2、ゼオライトなどの多孔質層２
４を予め形成したものである。また、ガラスのアルカリ
処理によって、多孔質層２４を形成することも好適であ
る。Further, a porous layer 24 having a hygroscopic property is formed on the inner surface side of the sealing glass 20. The porous layer 24 is formed on the inner surface of the sealing glass 20 by a sol-gel method or the like using a porous layer 2 of SiO 2 , TiO 2 , zeolite or the like.
4 is formed in advance. It is also preferable to form the porous layer 24 by treating the glass with an alkali.
【００１５】このような多孔質層２４は、吸湿効果を有
している。従って、不活性ガス中の密封室２２の形成に
おいて、密封室２２内部に封入されてしまった水分がこ
の多孔質層２４により吸着される。従って、密封室２２
内の水分を効果的に除去でき、素子部に対する悪影響を
確実に排除することができる。The porous layer 24 has a moisture absorbing effect. Therefore, when the sealed chamber 22 is formed in the inert gas, the moisture sealed in the sealed chamber 22 is adsorbed by the porous layer 24. Therefore, the sealed chamber 22
The moisture in the inside can be effectively removed, and an adverse effect on the element portion can be reliably eliminated.
【００１６】このような有機ＥＬ素子において、透明電
極１２と、金属陰極１８とに電圧を印加することで、両
電極１２、１８より、正孔、電子が注入され、これが発
光層１６において再結合し発光する。そして、封止ガラ
ス２０によって形成された密封室２２内に、正孔輸送層
１４、発光層１６、金属陰極１８からなる素子部が収容
されているため、大気からの酸素、水分の内部への拡散
が有効に防止され、素子特性への悪影響を排除すること
ができる。In such an organic EL device, by applying a voltage to the transparent electrode 12 and the metal cathode 18, holes and electrons are injected from the two electrodes 12, 18, which recombine in the light emitting layer 16. And emit light. Since the element portion including the hole transport layer 14, the light emitting layer 16, and the metal cathode 18 is accommodated in the sealed chamber 22 formed by the sealing glass 20, the oxygen and moisture from the atmosphere are not introduced into the inside. Diffusion is effectively prevented, and adverse effects on device characteristics can be eliminated.
【００１７】特に、本実施形態の素子においては、封止
ガラス２０の内面に吸湿性の多孔質層４が形成されてい
る。従って、製造時において、素子部の表面や透明電極
１２の表面に吸着されている水分がこの多孔質層２４に
よって除去され、密封室２２内を水分のない状態に維持
できる。よって、素子に対する水分の拡散を確実に防止
して、非発光点の発生を防ぎ、素子の長寿命化を図るこ
とができる。特に、高輝度発光させる場合においても、
長寿命化を図ることができる。In particular, in the device of the present embodiment, a hygroscopic porous layer 4 is formed on the inner surface of the sealing glass 20. Therefore, at the time of manufacture, the moisture adsorbed on the surface of the element portion and the surface of the transparent electrode 12 is removed by the porous layer 24, and the inside of the sealed chamber 22 can be kept free of moisture. Therefore, it is possible to reliably prevent the diffusion of moisture into the element, prevent the generation of non-light emitting points, and extend the life of the element. In particular, even when emitting light with high luminance,
The service life can be extended.
【００１８】また、上述の実施形態では、正孔輸送層１
４と、発光層１６を積層形成したが、混合有機層の一層
構成としてもよい。さらに、正孔輸送層１４ではなく、
電子輸送層を金属陰極１８側に設ける構成としてもよ
い。さらに、透明電極１２を陰極とし、対向電極を陽極
とすることも可能である。このように、素子部の構成に
は、現在知られている各種の構成を採用することができ
る。In the above embodiment, the hole transport layer 1
4 and the light-emitting layer 16 are laminated, but a single-layer structure of a mixed organic layer may be used. Further, instead of the hole transport layer 14,
The electron transport layer may be provided on the metal cathode 18 side. Further, the transparent electrode 12 can be used as a cathode and the counter electrode can be used as an anode. As described above, various types of currently known configurations can be adopted as the configuration of the element unit.
【００１９】[0019]
「実施例１」ＩＴＯの透明電極１２が予め形成されてい
るガラス基板１０上に、真空蒸着により、トリフェニル
ジアミンを７０ｎｍ堆積し、正孔輸送層１４を形成し、
その後キノリノールアルミ錯体を７０ｎｍ堆積し、発光
層１６を形成した。そして、この発光層１６上にＭｇＡ
ｇを３００ｎｍ蒸着形成し、金属電極１８を形成し、素
子部を形成した。[Example 1] On a glass substrate 10 on which a transparent electrode 12 of ITO was previously formed, 70 nm of triphenyldiamine was deposited by vacuum evaporation to form a hole transport layer 14,
Thereafter, a quinolinol aluminum complex was deposited to a thickness of 70 nm to form the light emitting layer 16. Then, on this light emitting layer 16, MgA
g was formed to a thickness of 300 nm, a metal electrode 18 was formed, and an element portion was formed.
【００２０】この素子部が形成されたものを窒素置換し
たグローブボックスに移し、グローブボックス内におい
て内面に多孔質層２４が形成された封止ガラス２０の端
部をエポキシ樹脂を用いて透明電極１２の表面に接着し
密封した。なお、封止ガラス２０の表面（内面側）に
は、ゾルゲル法でＳｉＯ2からなる多孔質層２４を予め
形成しておいた。The device on which the element portion is formed is transferred to a glove box purged with nitrogen, and the end of the sealing glass 20 having a porous layer 24 formed on the inner surface in the glove box is sealed with a transparent electrode 12 using epoxy resin. And sealed. The porous layer 24 made of SiO 2 was previously formed on the surface (inner side) of the sealing glass 20 by a sol-gel method.
【００２１】この素子を駆動電流１０ｍＡ／ｃｍ2で連
続駆動して輝度の半減寿命を測定した。初期輝度２００
ｃｄ／ｍ2で約２０００時間の寿命が達成できた。発光
面内での非発光点（ダークスポット）の数も少なく、駆
動電圧は初期８Ｖであり、輝度を維持するための駆動電
圧を上昇させたが、１２Ｖまでの上昇で済んだ。The device was continuously driven at a drive current of 10 mA / cm 2 , and the half life of luminance was measured. Initial luminance 200
A life of about 2000 hours was achieved at cd / m 2 . The number of non-light-emitting points (dark spots) in the light-emitting surface was also small, and the driving voltage was initially 8 V. The driving voltage for maintaining the luminance was increased, but only up to 12 V.
【００２２】「比較例」実施例１の手順で作成した素子
を窒素ガス中で多孔質層２４のない封止ガラス２０で封
止した。この素子を同様に１０ｍＡ／ｍ2で駆動したと
ころ、素子寿命は約５００時間であった。発光面内に
は、無数のダークスポットが観察された。さらに、輝度
を維持するために初期８Ｖであった駆動電圧が、２０Ｖ
まで上昇した。"Comparative Example" The element prepared by the procedure of Example 1 was sealed with a sealing glass 20 having no porous layer 24 in nitrogen gas. When this device was similarly driven at 10 mA / m 2 , the device life was about 500 hours. Countless dark spots were observed in the light emitting surface. Further, the driving voltage, which was initially 8 V in order to maintain the luminance, is changed to 20 V.
Up.
【００２３】「実施例２」実施例１と同様の構成で、正
孔輸送層１４に、トリフェニルアミンの４量体（ＴＰＴ
Ｅ）を採用し、封止ガラス２０の内面の多孔質層２４に
ＴｉＯ2を採用した。この素子を駆動電流１０ｍＡ／ｃ
ｍ2で連続駆動して輝度の半減寿命を測定した。初期輝
度２００ｃｄ／ｍ2で約４０００時間の寿命が達成でき
た。また、発光面内でのダークスポットの発生も非常に
少なく、駆動電圧の上昇は、初期８ｖから１１Ｖで済ん
だ。Example 2 The same structure as in Example 1 was used, and a tetramer of triphenylamine (TPT) was
E) was employed, and TiO 2 was employed for the porous layer 24 on the inner surface of the sealing glass 20. This element is driven at a driving current of 10 mA / c.
The half-life of luminance was measured by continuous driving at m 2 . A life of about 4000 hours was achieved at an initial luminance of 200 cd / m 2 . Also, the occurrence of dark spots in the light emitting surface was very small, and the rise of the driving voltage was only 8 V to 11 V in the initial stage.
【００２４】「比較例２」実施例２の手順で作成した素
子を窒素ガス中で多孔質層２４のない封止ガラス２０で
封止した。この素子を同様に１０ｍＡ／ｍ2で駆動した
ところ、素子寿命は約１０００時間であった。"Comparative Example 2" The element prepared in the procedure of Example 2 was sealed with a sealing glass 20 having no porous layer 24 in a nitrogen gas. When this device was similarly driven at 10 mA / m 2 , the device life was about 1000 hours.
【００２５】ここで、実施例２、比較例２を含み、多孔
質層２４に、ＳｉＯ2やゼオライトを用いた場合の素子
寿命及び駆動電圧の上昇について表１に示す。Here, Table 1 shows the element life and the increase in drive voltage when SiO 2 or zeolite is used for the porous layer 24, including Example 2 and Comparative Example 2.
【００２６】[0026]
【表１】 [Table 1]
【図１】 有機ＥＬ素子の実施形態の構成を示す図であ
る。FIG. 1 is a diagram illustrating a configuration of an embodiment of an organic EL element.
【符号の説明】 １０ ガラス基板、１２ 透明電極、１４ 正孔輸送
層、１６ 発光層、１８金属陰極、２０ 封止ガラス、
２２ 密封室、２４ 多孔質層。[Description of Signs] 10 glass substrate, 12 transparent electrode, 14 hole transport layer, 16 light emitting layer, 18 metal cathode, 20 sealing glass,
22 sealed chamber, 24 porous layer.
Claims (1)
れに対向する対向電極の間に有機材料からなる発光層を
狭持し、両電極からキャリアを発光層に注入することに
よって発光層を発光させる有機ＥＬ素子において、 上記少なくとも発光層及び一方の電極を囲う封止ガラス
板により密封室を形成し、この密封室内に不活性ガスを
封入すると共に、封止ガラス板の内面に吸湿性多孔質層
を設けることを特徴とする有機ＥＬ素子。A light emitting layer made of an organic material is sandwiched between a transparent electrode formed on a glass substrate and a counter electrode facing the transparent electrode, and carriers are injected into the light emitting layer from both electrodes to form the light emitting layer. In the organic EL device that emits light, a sealed chamber is formed by the sealing glass plate surrounding at least the light emitting layer and one of the electrodes, an inert gas is sealed in the sealed chamber, and a hygroscopic pore is formed on the inner surface of the sealing glass plate. An organic EL device comprising a porous layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9079596A JPH10275679A (en) | 1997-03-31 | 1997-03-31 | Organic el element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9079596A JPH10275679A (en) | 1997-03-31 | 1997-03-31 | Organic el element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10275679A true JPH10275679A (en) | 1998-10-13 |
Family
ID=13694390
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9079596A Pending JPH10275679A (en) | 1997-03-31 | 1997-03-31 | Organic el element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10275679A (en) |
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|---|---|---|---|---|
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| JP2000268954A (en) * | 1999-03-17 | 2000-09-29 | Matsushita Electric Ind Co Ltd | Electroluminescent element |
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